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Maraging steel
- 2. Maraging steels • Which are low carbon, highly alloyed steels. • Which are very high strength COMPOSITION: • 18% NICKEL 7% COBALT • Less than 0.05% carbon content • Small amount of other elements such as TITANIUM
- 3. • The above compositions develop martensite up on cooling ( by air quenching) • To achieve high tensile strength- Below the austenitizing (723 ˚c) temperature • Various compositions of maraging steels: – Ni-18% Co-8.5% – Mo-3% Ti-0.2% – Al-0.10% C-0.01%
- 4. TO ACHIEVE HIGH TENSILE STRENGTH • Maraging steel from the austenitizing temperature (723 ͦc) Air cooled Martensite steel --- which having high ductile and tough Precipitation Hardening done on the steel ---- to achieve high tensile strength
- 5. MARAGING STEEL MICRO STRUTURE
- 6. CHARACTERISTICS •Due to the low carbon content maraging steels have good machinability. • Prior to aging, they may also be cold rolled to as much as 80–90% without cracking. •Maraging steels offer good weldability, •When heat-treated the alloy has very little dimensional • Due to the high alloy content maraging steels have a high hardenability. •The steels can be nitrided to increase case hardness, and polished to a fine surface finish.
- 7. APPLICATIONS 1. HEAT RESISTANCE STEELS: – Valves in IC engines, Steam and gas turbines, etc., 2. HADFIELD’S MANGANESE STEELS: – Pneumatic drill bits, Rock crusher, etc., 3. FREE MACHINING STEELS: – Reduce rubbing against cutting tool 4. MAGNET ALLOYS: – Permanent magnet made from iron along with nickel.
- 8. APPLICATIONS •Shafts •Barrel For Firing Guns •Dies In Casting •Extrusion Rams •Space Vehicle Cases •Components Subject To Impact Fatigue, Such As Print Hammers Or clutches.